A refined structural analysis of the PTCDA monolayer on the reconstructed Au(111) surface - "Rigid or distorted carpet?"
A refined structural analysis of the PTCDA monolayer on the reconstructed Au(111) surface - "Rigid or distorted carpet?"
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DOI：
10.1016/j.susc.2006.03.049
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发表时间：
2006-07-01
期刊：
影响因子：
1.9
通讯作者：
Sokolowski, M.
中科院分区：
文献类型：
--
作者：
Kilian, L.;Umbach, E.;Sokolowski, M.
Mannsfeld等人报道了PtCDA在(22x根3)重构的Au(111)表面上的超结构(H1和H2)。首页--期刊主要分类--期刊细介绍--期刊题录与文摘--期刊详细文摘内容电子。2(2001)121]，用高分辨低能电子衍射(SPALEED)对其进行了重新研究。本研究的目的是详细地阐明均一吸附层相对于Au(111)表面三个重构区域的点对线(p-o-L)结构关系。对于H2(非平衡)结构，发现了没有光斑分裂的衍射图，这表明(22x根3)重构的磁区边界几乎完全未受干扰地过度生长。因此，上层建筑并不严格遵循P-O-L关系，而只是以平均的方式。相反，对于H1相(平衡结构)，观察到了光斑分裂，这表明不同Au(111)重构域上的超结构域显示出略有不同的角取向，因此在所有Au(111)重构域上采用p-o-L关系。因此，根据制备条件，Au(111)上的PTCDA层可以被认为是刚性或扭曲的地毯。(C)2006爱思唯尔B.V.保留所有权利。
The superstructures (H1 and H2) of peryienetetracarboxylicacid-dianhydride (PTCDA) monolayers on the (22 x root 3) reconstructed Au(111) surface reported by Mannsfeld et al. [S. Mannsfeld, M. Toerker, T. Schmitz-Hiibsch, F. Sellam, T. Fritz, K. Leo, Org. Electron. 2 (2001) 121] are reinvestigated by high resolution low energy electron diffraction (SPALEED). The purpose of this investigation is to elucidate in detail the point-on-line (p-o-l) structural relation of the homogeneous adsorbate layer with respect to the three reconstruction domains of the Au(111) surface. For the H2 (non-equilibrium) structure, diffraction patterns without a spot splitting are found, indicating an almost perfect undisturbed overgrowth of the domain boundaries of the (22 x root 3) reconstruction. As a consequence, the superstructure does not follow strictly the p-o-l relation, but only in an averaged manner. Contrary for the H1 phase (equilibrium structure), a spot splitting is observed, which indicates that superstructure domains on different Au(111) reconstruction domains exhibit slightly different angular orientations, thus adopting p-o-l relations on all Au(111) reconstruction domains. The PTCDA layer on Au(111) may be thus considered as a rigid or distorted carpet, depending on the preparation conditions. (c) 2006 Elsevier B.V. All rights reserved.